107 lines
2.3 KiB
C
107 lines
2.3 KiB
C
/* Copyright 2014 The Chromium OS Authors. All rights reserved.
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
/* Tiny charger configuration */
|
|
|
|
#include "common.h"
|
|
#include "debug_printf.h"
|
|
#include "ec_commands.h"
|
|
#include "registers.h"
|
|
#include "rsa.h"
|
|
#include "rwsig.h"
|
|
#include "sha256.h"
|
|
#include "system.h"
|
|
#include "task.h"
|
|
#include "usb_pd.h"
|
|
#include "util.h"
|
|
#include "version.h"
|
|
|
|
/* Large 768-Byte buffer for RSA computation : could be re-use afterwards... */
|
|
static uint32_t rsa_workbuf[3 * RSANUMWORDS];
|
|
|
|
extern void pd_rx_handler(void);
|
|
|
|
/* RW firmware reset vector */
|
|
static uint32_t * const rw_rst =
|
|
(uint32_t *)(CONFIG_PROGRAM_MEMORY_BASE+CONFIG_RW_MEM_OFF+4);
|
|
|
|
/* External interrupt EXTINT7 for external comparator on PA7 */
|
|
void pd_rx_interrupt(void)
|
|
{
|
|
/* trigger reception handling */
|
|
pd_rx_handler();
|
|
}
|
|
DECLARE_IRQ(STM32_IRQ_EXTI4_15, pd_rx_interrupt, 1);
|
|
|
|
static void jump_to_rw(void)
|
|
{
|
|
void (*jump_rw_rst)(void) = (void *)*rw_rst;
|
|
|
|
debug_printf("Jump to RW\n");
|
|
/* Disable interrupts */
|
|
asm volatile("cpsid i");
|
|
/* Call RW firmware reset vector */
|
|
jump_rw_rst();
|
|
}
|
|
|
|
int is_ro_mode(void)
|
|
{
|
|
return (uint32_t)&jump_to_rw < (uint32_t)rw_rst;
|
|
}
|
|
|
|
static int check_rw_valid(void *rw_hash)
|
|
{
|
|
int good;
|
|
|
|
/* Check if we have a RW firmware flashed */
|
|
if (*rw_rst == 0xffffffff)
|
|
return 0;
|
|
|
|
good = rsa_verify((const struct rsa_public_key *)CONFIG_RO_PUBKEY_ADDR,
|
|
(const uint8_t *)CONFIG_RW_SIG_ADDR,
|
|
rw_hash, rsa_workbuf);
|
|
if (!good) {
|
|
debug_printf("RSA FAILED\n");
|
|
pd_log_event(PD_EVENT_ACC_RW_FAIL, 0, 0, NULL);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
extern void pd_task(void *u);
|
|
|
|
int main(void)
|
|
{
|
|
void *rw_hash;
|
|
|
|
hardware_init();
|
|
debug_printf("%s started\n",
|
|
is_ro_mode() ? "RO" : "RW");
|
|
|
|
/* the RO partition protection is not enabled : do it */
|
|
if (!flash_physical_is_permanently_protected())
|
|
flash_physical_permanent_protect();
|
|
|
|
/*
|
|
* calculate the hash of the RW partition
|
|
*
|
|
* Also pre-cache it so we can answer Discover Identity VDM
|
|
* fast enough (in less than 30ms).
|
|
*/
|
|
rw_hash = flash_hash_rw();
|
|
|
|
/* Verify RW firmware and use it if valid */
|
|
if (is_ro_mode() && check_rw_valid(rw_hash))
|
|
jump_to_rw();
|
|
|
|
/* background loop for PD events */
|
|
pd_task(NULL);
|
|
|
|
debug_printf("EXIT!\n");
|
|
/* we should never reach that point */
|
|
system_reset(0);
|
|
return 0;
|
|
}
|